Miley Cyrus - Miley Cyruses Go Head To Head In Animal Contest

The famous father and daughter are also competing against Kelly Osbourne and actors Peter Facinelli and Eric Stonestreet in the Twitter For The Critters Celebrity Challenge in aid of the Onyx And Breezy Foundation.

Online users have been urged to donate $5 (£3.10) to the animal organisation and vote for their favourite star campaigner at the same time - and one lucky supporter will win a signed poster.

And the Party in the U.S.A. hitmaker is rallying her Twitter.com followers to back her on the site's challenge.

In a series of posts, she writes, "I want everyone to vote team Miley to win a signed poster and save the animals! Woke up in a bad mood. Hate those days. The only thing making me :) is all my fans saving the animals! So proud of y'all! Vote vote vote please!!